Step 2 - Ensure the Show All option is clicked on the left menu.
Step 3 - Select Settings then Domains.
Add domain
Step 1 - Select Add Domain.
Step 2 - Enter the domain you want to add, then select Use this Domain.
Step 3 - You will be provided with a TXT record to add to your domain management area. Log into the relevant DNS manager and add the required record.
Note: Sometimes, DNS records take a while to propagate globally. If so, you may get this error message. In this case, use a tool like Whats My DNS to check the propagation of the record, and click Try Again when your Microsoft record is fully propagated.
Step 4 - Click Continue.
Step 5 - For Microsoft Office to work, you will only need to add the three records under Exchange and Exchange Online Protection. You will also have the option of adding additional DNS records for added functionality.