External SSD doesn't mount

[Xxxarl]

Hi All,
I'm Carl and new to the forum.

I have an external Seagate 1 TB SSD for my Time Machine backup.

Now it doesn't mount. Tried different actions with disc util, as "mount on desktop" and "show info" (see images).
I also changed the cord, tried to another iMac. with no luck.

It used to run without any problems.

I'm on a iMac Pro running Big Sur (v.11.6.1)

Any advise?

/Carl