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InvalidAuthenticationToken Access token is empty

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Posted on by flarebear

Canvas app with gallery of image controls. Each image control is tied to a URL of a .PNG file or .JPG file. Sometimes images do not display in the gallery and browser dev tools reveal a call to a Graph URL https://graph.microsoft.com/v1.0/me/photo/$value

which returns a 404 not found. Details on that error show:

{
"error": {
"code": "InvalidAuthenticationToken",
"message": "Access token is empty.",
"innerError": {
"date": "2020-11-06T13:47:28",
"request-id": GUID,
"client-request-id": GUID
}
}
}

There is a known problem with token handling in Microsoft Graph. See https://docs.microsoft.com/en-us/graph/known-issues

Is the problem with missing images in PowerApps a manifestation of the same underlying token handling problem in Microsoft Graph ?

Categories:

Building Power Apps

graph404.PNG

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summitb on at

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Don't think you can get it easily with a guest request. How about use custom connectors for it?

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flarebear 27 on at

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Hi @summitb ,
That may be so and custom connectors may well handle images differently, but by now we've worked around the problem by using base64 strings to store image data. That is not our preferred solution, but it is sufficient for our purposes for now. Cloud-based systems like this absolutely have to have reliable authentication systems with decent remedies for occasions when authentication fails. Apart from either using custom connectors or using base64 strings, PowerApps developers seem to be pretty much stranded if they want reliable image rendering in the browser.

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