Same problem. I opened NMM and it notified me about the update, but I said no thanks. A minute later I tried to download a mod but I got the warning that I'm not logged in, so I decided to update. Now after starting NMM it says "Validating API key" but it fails to log me in. Pointless complication.
NMM Community Edition won't Validate API Key
in Skyrim SE
Posted
Same problem. I opened NMM and it notified me about the update, but I said no thanks. A minute later I tried to download a mod but I got the warning that I'm not logged in, so I decided to update. Now after starting NMM it says "Validating API key" but it fails to log me in. Pointless complication.