Error messages after maintenance: BLZBNTBNA0000000C ; WOW51900223

BLZBNTBNA0000000C
WOW51900223

Hello, since the maintenance today in WoW WOTLK Classic, I get these 2 errors, first is Battle net and second, when I log into wowclassic.exe in the login screen. All Servers show as “incompatible” and I cannot even update anything on battlenet. I updated the drivers and turned off security programs, but nothing helped.
I tried to deinstall battlenet but it doesn’t work and the same message occurs then.

Update:
After I did

battlenet worked again but it can’t locate WoW Classic WOTLK even though it is still there. I wants to install and not update it after the maintenance.
After that I was able to deinstall battlenet and then it located the games again and I could upgrade!
Thanks for the tip from another post it worked, now I am in this horrible queue but it worked!

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