Cannot connect device to account

The Thingy91 is not connecting to the account, when I try to add LTE to an account I get this error:

There was an error adding your device: nRFCode 40101: Device nrf-352656101077652 is already associated with another tenant.

Reset a device gives me this error:

There was an error: Request failed with status code 404
And I cannot generate new device certifications.