Hello @Hamza Nisar ,
You could follow below steps to create:
- Click tools-DNS
- Click to expand your server name
- Expand Forward Lookup zones
- Select the domain for which you would like to create an Auto discover record.
- Right-click the domain name and select New Alias (CNAME)
- In the Alias Name field, type Auto discover
- Type the fully qualified domain name
Check if the issue still persist after you create the record.
And if you find any issues after this solution then, please feel free to post back.