Allow Access problem

Hello there,
This morning I first released my app to several hundred users. One of them encountered the following message each time he tried to open the site:

He was the only one who contacted me, I suggested that he try his wife’s device and it did work, and it is probably a local malfunction.
However, I am quite worried that there may be a problem with my site settings and there are other users who have simply been afraid to contact me. As you can see the fault description is truncated and cannot be read in full in any way.
If anyone here encounters such a problem, or can speculate on why it is caused, I would be happy to help.

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