When adding the ASBCE to MS Teams, you must verify the domain part of the ASBCE FQDN. For example, for the FQDN sbc.example.com, you must verify that you have administrator rights for the example.com domain.
Verification requires you to do one of the following:
Add a TXT record to the domain's DNS records.
Add an MX record to the domain's DNS records.
Add a text file to the root of the domain's default web site.
