Hi,
Can you check the region that you are and if supports the calling plan - country-and-region-availability-for-audio-conferencing-and-calling-plans
AFAIK, the E1,E3 and E5 Licenses allow you to use Teams Call and Phone System only works with E1, E3 and E5 Licenses Officially
==
Please "Accept the answer" if the information helped you. This will help us and others in the community as well.