Datacrons are arcane

Your roster was locked at the end of the Grand Arena join period.

Any changes you make to your roster (gear/ability upgrades, modding, Datacrons etc) after that point will not be available for the ongoing round.

You'll see the changes in the next round you join.

Datacrons, gained via conquest etc will give your team specific boosts but only if the datacron aligns with your team. Try to get used to them as they are major influencers even against GLs. Look them up or join discord servers to help.

There's no way that I can see to add datacrons until after you join, and go to a specific battle with that squad. Furthermore, the error message should say something else, if what you say is the case.

Not an answer to the question I posed. If you read what I wrote, I specifically stated that the datacron aligned with the team, as far as I could tell.

I mean, they could add "for this event" at the end of that sentence, but the meaning still carries and they'd probably rather have one message.

Your datacrons will be available next week. Yes, you add them to use with a specific squad at the battle screen. But what you were told above is that your whole roster locks in for the week when you sign up. If you swap mods, raise gear, etc., those won't be reflected in the current week.

It may be helpful for you to look up a guide on datacrons to get all the ins and outs. For example, you can use all the stats of a datacron (crit damage, etc.) even if no one on the team qualfies for the level 3, 6, or 9 bonuses.

They arent going anywhere, use them

I completely understood, you just dont understand how to reroll certain levels etc. Its you that needs to understand how stats, factions etc can help. Dont moan if you dont know how to invest.

Im going to say, datacrons are not arcane. Stupid title.

Just read the datacrons at 3,6,9 and in between is team bonuses. Are we now reduced to people who cant read?

OK, so I'm going to try to explain DCs, with a bit of commentary every now and then.

First off, unfortunate as it is, DCs are here to stay and are an important part of the game, at least in PvP. I myself enjoy the general idea behind them, the main issue I have is that some DCs are laughably pathetic while others are ludicrously OP, and once you put the OP ones in GL teams it just gets even worse. If they made it so that DCs can't be applied in GL teams, or at least make it so only the stat bonuses apply but nothing else, it would be a major improvement in my eyes. Yes, there still would be the issue of, let's say, LV teams with high evasion, but nothing as nauseating as LV teams with ridiculous stats and constant cooldown reduction, Rey with the immortal Resistance and Holdo DC a few months ago, etc.

Second, this is where I try to explain how DCs work, so you'll have to excuse me if it seems like I'm treating anybody like a novice. DCs are special items that give bonus stats and mechanics to teams as long as the characters are at a certain relic level. To be able to apply any DC at all, the entire team must be at least R1 (previously R3). Once you upgrade a DC to lv3, you get an allignment mechanic, e.g., if you get a Dark Side "When DS characters use a Basic ability, they gain Speed Up" that applies to everyone who is a Dark Side character. At lv6, you get a class mechanic - it used to be a faction mechanic, like for Rebels, Empire, Nightsisters, etc., but they changed it to focus on the different character roles, i.e., Attacker, Tank, etc. The entire team needs to be at least R3 (previously R7) for this bonus to be applied (even if you have only 1 character that benefits from it, the team still needs to be R3). The Lv9 mechanics are for specific characters, like right now you have bonuses for Nest, Wampa, Sabine, etc. Unless I'm mistaken, the entire team needs to be at least R3 while the character themselves have to be R7. If you didn't get the mechanic you were aiming at, be it allignent, faction or character, you can reroll to try and get it again. DCs come with their own unique currency and materials. You can't use Relic mats, signal data, gear pieces or crystals to upgrade them, you need to have specific materials. They're mainly available in Conquest, and also in TWs and their own store. This also applies to different sets of DCs, meaning you have one type of materials for the first set and a second type for the other. The materials in this regard are basically the same, just different colors; for clarity's sake, imagine you have blue crystals you can only use in X store, and green crystals you can only spend at Y store. Each set lasts for about 3 months, after that they expire and you are refunded a certain portion of what you used to upgrade them, only you receive the refund in the form of materials for the latest set. As others have pointed out, DCs are locked once you sign up for TWs and GAC, just like Gear, Zetas, Relics, Mods, etc. If you upgrade or reroll a DC , you'll have to wait for the next event to be able to use it. I think that's about it.

Also, I'd like to add that pure GP doesn't matter, unless it's a requirement to enter an event (like needing 4M for Proving Grounds) or for deployments in TB. It's mostly about synergy. You can have a squad with 200k GP against an enemy team with 90k, it won't make any difference if the enemy has amazing synergy while your characters have none.