Hi All,
I have been working on a app that gathers data from a SharePoint list with the intention that it can be shared with guests however I don't seem to be able to share it without errors externally. I am following the guidance on the MS website so I'm not sure where I'm going wrong or if this is just possible yet. I have provided my procedure and errors below and if anyone could help I would appreciate it, Please ask if you require anymore information.
I invite the external account to join our tenant as a guest is Azure AD.
I assign the guest account a power-apps license in Azure AD
I add the guest to the SharePoint site's membership which allows them to read the list that is showing in the app.
The guest then receives two email's, 1 to join our organisation as a guest which all is ok, The 2nd email is sharing the powerapp with them, When following the link they get something that looks like the below image

the only difference being there is no pre-populated email address, When the guest try's to sign in and allow I'm guessing to authorise or create a SharePoint connection it returns an authentication error and provides a session ID but that's all.
I hope this makes sense , I appreciate any help anyone can provide.