Portal for ArcGIS: Sorry, you do not have permissions to access this application

Error Message

When attempting to access an ArcGIS Experience Builder app from the Portal for ArcGIS Content page, the following error message is returned:

Error: 
Sorry, you do not have permissions to access this application.

Additionally, attempting to edit or delete the app in Portal for ArcGIS fails.

Cause

The app is corrupted. This renders Portal for ArcGIS incapable of identifying the app.

Solution or Workaround

The following are two workflows to potentially identify what is corrupted and resolve the issue.

Note:
The workflows require administrative privileges to modify the files stored in the Portal install directories for the application.

Review the iteminfo.xml file

When the Experience is corrupted, it is often due to additional characters added to the contents of the iteminfo.xml file.

Note:
It is recommended to back up the XML file and validate it using an XML validation tool.

1. Open the XML file and edit it using a text editor. The default file path directory of the iteminfo.xml file is:

C:\arcgisportal\content\items\<GUID of experience Builder application>\esriinfo\

2. Search for and remove examples of the bold text below:
   • Additional n> tag included in the closing tag, for example: </ESRI_ItemInformation>n> rather than </ESRI_ItemInformation>
   • Random characters in the closing tag, for example: adbasdhjasdhjh</url></ESRI_ItemInformation>

Recreate the PBF file

If the previous workflow does not resolve the issue, it is advisable to recreate the PBF file.

1. Navigate to the Portal directory and rename the PBF file to iteminfo_old.pbf.
2. Launch the Experience.

Note:
If the PBF file is not available in the Portal directory, launch the Experience. Launching the Experience recreates the file.