There was a google apps script to be embedded in an iframe on one of our websites. I've done this before with no issues, as long as the XFrameOptionsMode is set properly in the script to ALLOWALL. But in this case, I was getting a too many redirects error. "accounts.google.com redirected you too many times."
Checking the network traffic (right-click -> Inspect -> Network tab), found that the app was redirecting to google's login authentication page, back to the app's original script.google.com address, and again, infinitely till the browser stops the loop after 25 times or so.
Checking the app's deployment, found that this was due to the deployment availability being set to "Anyone with a Google Account" instead of "Anyone". Once the deployment was changed to "Anyone", the embed worked fine.
(This link has one approach in which validation can be done, but I didn't go through it in detail to check if it is embed-friendly.)
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