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Elementary has the same problem with its mail app.
Because the problem is Google not wanting third party apps accessing their service.
Edit: In other news, I just tried it and GMail works just fine with KMail. Setting up is a three step process and automatic most of the way.
@Bro666 I tried it on Fedora 40 with Plasma 6. Don’t know if it’s broken there or not. In any case, the account wizard repeatedly showed me a screen with only a back and quit button when the account hadn’t yet been created.
Also kept telling me I had set up 2 accounts and asking if I’d like to unify them.
Haven’t heard this one before, but it sounds like a trip to https://bugs.kde.org to me. Check if it hasn’t been reported. Maybe also check on Fedora, as it may be something going on there.
Thanks for your help!