Self-Service for Salesforce Enterprise App - the blade doesnt load.

Question

I started to provision self-service for a DEV salesforce app on my Azure (basic) site.
The SSO elements and user provisioning work ok - but when I try to set the Self Service "Get started" I see this error:

{ "shellProps": { "sessionId": "b4b5bf6d25c44b33a560544ac365d5c1", "extName": "Microsoft_AAD_IAM", "contentName": "SelfServiceAppAccessPart" }, "error": { "message": "An error occurred while processing this request.", "code": 500, "error": { "message": "", "name": "FetchDataError", "stack": "FetchDataError\n at r.t (https://portal.azure.com/Content/Dynamic/zA65xCZ3Gcyw.js:76:895)\n at r (https://portal.azure.com/Content/Dynamic/ytqBkxW8Wt5R.js:18:248)\n at new r (https://portal.azure.com/Content/Dynamic/ytqBkxW8Wt5R.js:18:465)\n at yt (https://portal.azure.com/Content/Dynamic/ytqBkxW8Wt5R.js:99:715)\n at https://portal.azure.com/Content/Dynamic/ytqBkxW8Wt5R.js:99:6610", "extension": "Microsoft_AAD_IAM", "type": "MsPortalFx.Errors.FetchDataError", "baseTypes": [ "MsPortalFx.Errors.FetchDataError", "MsPortalFx.Errors.DataError", "MsPortalFx.Errors.Error" ], "errorLevel": 2, "timestamp": 11012, "innerErrors": [], "dataSetName": "DataCache:62:7" } }}

I had created (and removed) an associated security group for this - as provisioning won't work against a group in my subscription. Since then I can't even get to the blade.

Any ideas how I can get this option working on my basic subscription, or how I can at least fully revert so the blade works?

I guess my last resort will be to remove and recreate a new enterprise app...but I'd appreciate some troubleshooting advice is possible.

Thanks in advance