I'm trying to set up a D717 for MS Teams registration and the provisioning link you have given doesn't start.

https://emea.ipp.sdg.teams.microsoft.com/

Is everything OK with the procedure you have on the net? 

https://service.snom.com/display/wiki/How+to+connect+desktop+phones+with+MS+Teams+gateway

I'm following the instructions in the manual and the phone's firmware is the latest (snomD717-SIP 10.1.184.14).