@EA_Kent I'm using a Windows PC, Google Chrome. During the week, image uploads worked just fine for me. However, starting Saturday morning the validation issue arose. I was not doing anything different from before. I tried logging in on an incognito tab, no change. I cleared my cache, no change. I restarted my computer and then did all those things again, no change. I've tried during off-peak hours now, no change. I used every troubleshooting method I could think of prior to posting in this forum. Hopefully that info helps the tech team figure things out.
At first I was worried that team builder had been deliberately shut off due to abuse or something, but based on what I've heard so far, that doesn't seem to be the case. Something I also noticed is that a team doesn't need to have any custom logos whatsoever for it to get rejected at submission. So, something appears to specifically be broken with content moderation, causing it to reject anything and everything regardless of content.