Error creating sharepoint page as an Teams app with App Studio

Hi,

I have tried to follow this guide https://docs.microsoft.com/en-us/sharepoint/dev/features/embed-pages-to-teams to add a "intranet" button on the left sidebar in Teams. 

When I try to install the app, I get an error message that says: Something went wrong. If you want more information go to aka.ms/teamsdocs.(translated from norwegian).

When testing the app I only get this error message:

If I remove "https://nmasno.sharepoint.com" from the resource info under it says:

• MPNID cannot be empty
• StaticTabs are only supported in personal scope

Here`s the app manifest:

{
  "$schema": "https://developer.microsoft.com/en-us/json-schemas/teams/v1.9/MicrosoftTeams.schema.json",
  "manifestVersion": "1.9",
  "version": "1.0.0",
  "id": "bd35e7e3-50b0-403b-82f3-6a9943aa1099",
  "packageName": "com.nmas.portal.app.nyttiginfo",
  "developer": {
    "name": "Nerliens Meszansky",
    "websiteUrl": "https://www.nmas.no",
    "privacyUrl": "https://www.nmas.no/om-oss",
    "termsOfUseUrl": "https://www.nmas.no/om-oss"
  },
  "icons": {
    "color": "color.png",
    "outline": "outline.png"
  },
  "name": {
    "short": "Nyttig info",
    "full": "Interninfo til ansatte i Nerliens Meszansky"
  },
  "description": {
    "short": "Intern side for nyttig info",
    "full": "Dette er en Teams app som peker til en Sharepoint-side som samler all nyttig info internt i NMAS.\n- Patrick P."
  },
  "accentColor": "#FEAE25",
  "staticTabs": [
    {
      "entityId": "1971917",
      "name": "FirmaHub",
      "contentUrl": "https://nmasno.sharepoint.com/sites/intranett/_layouts/15/teamslogon.aspx?SPFX=true&dest=/sites/intranett/SitePages/Home.aspx",
      "scopes": [
        "personal"
      ]
    }
  ],
  "permissions": [
    "identity",
    "messageTeamMembers"
  ],
  "validDomains": [
    "nmasno.sharepoint.com"
  ],
  "webApplicationInfo": {
    "id": "00000003-0000-0ff1-ce00-000000000000",
    "resource": "https://nmasno.sharepoint.com"
  }
}

Attached you will also find the app package

I have tested this inn App studio for Teams in MacOS 11.2 and Teams in Windows 10.