#1 You can either see if you can restore a from a backup:
Back up and recover account credentials in the Authenticator app
#2 Reach out to Tumblr support:
https://www.tumblr.com/support
If this is helpful please accept answer.
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I signed my tumblr account on Microsoft authenticator and by accident the account was removed, now I can't get the access to my account without the authenticator code... I need a solution to login my account without authenticator code or recover the authenticator code.
#1 You can either see if you can restore a from a backup:
Back up and recover account credentials in the Authenticator app
#2 Reach out to Tumblr support:
https://www.tumblr.com/support
If this is helpful please accept answer.