"Your Phone" sending every SMS twice

PC is W10 1903, phone is GS8 Pie. Title says it all.

Any suggestions?

I never managed to get this to work. It always said, when I had it installed on my phone and PC, that it was running an outdated version and I had to download again. Kind of like an endless loop. Anyway, if you unlink your phone and uninstall everything and then set it all up again, do you get the same issue?