When reviewing the screen shot it seems you install MABSv3 RTM version (13.0.415.0) and you are trying to protect the Azure Stack HCI.
The support for Azure Stack HCI started from MABSv3 UR2, please find below the link for protection matrix.
https://learn.microsoft.com/en-us/azure/backup/backup-mabs-protection-matrix#vm-backup
Please upgrade MABS to MABSv3 UR2 using the below link and then try to install the agent on Azure Stack HCI which should address the issue which you are currently experiencing.