This article about verify public DNS support Microsoft Teams include CNAME and SRV record.
Go to Microsoft 365 admin center > Settings > Domains > select domain > and click Manage DNS.
Select "Skype for Business" and get DNS record include CNAME record and SRV record.
Examples prepare information for add DNS record.
Examples create public DNS record.
After completed DNS record (can you validate via MX toolbox) Go to Settings > Domains > select Domain name > click Check Health.
















