The [ENTER] button on my iMac wireless’ keyboard no longer works.
I have another wireless keyboard but as opposed to the QWERTY I need, it is a QWERTZ set up which makes entering my password impossible.

And for some inexplicable reason, the QWERTZ suddenly refuses to pair with my tablet?
How do I manage to write this post you ask?
Well, I have a 3rd QWERTY small keyboard I sometimes use with my phone and it is currently connected to my main computer till I find a solution.
I am having a bad computer day
No choice but order a new keyboard which is now done via Germany in order to get a QWERTY. Delivery within 48 hours.
Problem solved within 24h