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Sounds like your Steam account may have been compromised.
Don't remember the order. The last ( << ?) - your account doesn't have to have The API Key - has to be empty.
First like scan for malware (I usually just reinstalling Windows)... Deauthorize all other devices, change password from a trusted/clean device never did it... though my account probably was once compromised check if everything alright with your e-mail EDIT and if phone number here wasn't changed , etc... Generate New Backup codes for mobile app. Seems it all.
https://help.steampowered.com/en/faqs/view/06B0-26E6-2CF8-254C
There