Errors occur while writing a tape label
Most often, this occurs as a result of a timing issue in the tape drive’s firmware. The backup system performs a fast seek to the last dataset and determines that the tape has arrived before it actually has arrived.
In order to fix this, open the Legacy UI, go to Settings > System Updates and Licensing > General Configuration (advanced). Expand the “tape Commands” section. Locate the “AdvancedTapePositioning” object and change the value from 1 to 0. This will incur a penalty of taking longer to fastforward to an available space on tape when appending backups to a tape already prior used, but will solve some compatibility issues.