Hi venukam82699228,
Within the Mobile Services UI when you click the Add button.
In the dropdown list of reportsuite, the only reason to not find the reportsuite you are seeking is,
1) the reportsuite has already been created as a manage mobile app, there can only be 1
2) you do not have access to the reportsuite with the user account you are logged into the Experience Cloud for the Mobile UI.
Regards,
Jen