Concatenation formula issue

Hello,
Already done unfortunately, it doesn't work..

Hello DDD,

A formula (which must start with the sign " = ") is entered in a
cell in Standard format.

However, you first entered your formula in a cell in text format =>
the formula remains displayed as it is, without being calculated.

To fix this, you need to change your cell back to Standard format, but not
only: when you are on your cell, press F2 (=> in edit mode for the
cell, and text cursor at the end of your formula) and then Enter.

You should see the result of your formula; if not, and if you have only formulas
displayed and no result, press Ctrl 3 (not the one on the numeric keypad).

Re

You deleted, not erased, it's different!

So please try to submit your model at the address where you found this one and come back to paste the created link here
remove any confidential information if necessary, we are only interested in the relevant data
looking forward to hearing from you
best regards