Privet from Russia! I have this problem: It looks like your Steam Guard Mobile Authenticator is providing incorrect Steam Guard codes.
I found your answer to the same question on November 16, 2018 and in it you said:
Where to find this secret, I could not understand.
P.S. The first time I wrote a bot, there was no such error, but I accidentally deleted it and did not notice this, and therefore I had to write it again and now this error has appeared. Thanks in advance for your reply!