External user with read permission cannot view Site Page of a SharePoint Teams site.

Hello,

How are the other pages created in this team? Are they based on other channels? 
Working with Teams-connected SharePoint sites can be a bit tricky. If the external user is invited through the MS Teams interface, they become members by default. Adding someone directly from the SharePoint site as a reader works, but there is a difference if it has multiple channels in different categories (private/shared). 

Is there any reason you would like to use a teams-connected site with the external user? 

To resolve this issue, please navigate to the site pages library and identify the .aspx page that the user has edit permissions on. Select that page and see the permissions given. 

Yours sincerely,
Aref Halmstrand

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