An error occurred while saving the commentMike McGowan commented
Big Bug! I only recently got teams calling and only discovered this bug this morning.
I work i telecoms so coincidentally I have a DTMF app on my phone that worked!
I have no affilliation with this app and I'm sure there are other apps available, but it is called, funnily enough, DTMF!
This is just a workaround though and this bug definitely needs fixing.