Problem with Share.Call Phone Number

I need to insert hash sign # into the dialer line
I dumped the concatenation of variables into a string for viewing and control.
All symbols are visible on the application screen.
"hash sign #" is visible, “commas” are visible.
But after transferring to the dialer, only numbers and commas are visible.
Can’t see “hash sign #”
2021-09-12 20.58.21 x.thunkable.com dbe1ebe209f0

That is the problem.
Tried different combinations of variables with no success.
Have you had this problem? I would be grateful for your help!

Link to problem project.

This works on my iPhone 11. It displays the # symbol. What kind of device are you testing this on?

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