Can't other users in my organization call this user?
Based on your description, please follow these steps to troubleshoot:
- Make sure the customer's number is correct.
- Whether your device settings are correct.
- Make sure that Teams calling licenses are assigned correctly and check if your calling capabilities are restricted.
- Try to replace another account to call this user.
Hope this helps! Moreover, if the above is not your scenario or I have misunderstood anything, please correct me and provide us with detailed information about the issue including the screenshot so that we can better understand to further assist you.
If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment". Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.