I keep getting an error saying I can't buty packs with FC points EAFC 24

no solution yet i guess

You will get the 4600 points on friday. Some people already have them, but they cant be used until friday. So you need to get 7,5k coins to buy the pack.

I had the same problem. 

I fix the problem with logging into fifa 23. I go into fifa ultimate in fifa 23 and exit the game correctly by logging off ultimate in fifa 23 and then exit fifa 23. 

I go to the fut wep app again and updated it. (First time there was an error and I needed to pick nation again even I had done it. But I log out and in again and then I went back to the nation I picked first)

Then I could use my 4600 fc points.

Hope it works for you.

everyone on console can buy points and there are videos eveywhere of non partner network players using points so not sure why you are not explaining that this is a PC only issue, and indeed why is it PC are suffering? 

i was able to use my Ea points as so has alot of others, I guess some people cant? doesnt seem fair