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What does "time machine not configured" mean
iMac 21.5″, macOS 10.15
Just what it says, it is not configured. However it might be an error. Begin by restarting in Safe Mode with all wired peripherals disconnected (including your TM EHD) and then restart normally and test Time Machine. You can learn how to do a Safe Mode restart in Safe Mode Reset
If you *have* configured time machine, it means that your backup is corrupted.
My thoughts on backup disks are the same as my rule on underwear: It it's doubtful, it's dirty.
I would throw away this disk, get another one, format it APFS and start fresh.
Time Machine
