An error that I only met Safari and which I managed to solve at the last moment. Google Analytics Internal Error.
I am a Mac user for over 10 Safari. Both on Mac and on iPhone, iPad, Safari seemed to me the most stable and safest browser. Especially since I use Keychain, Apple Pay and other Apple services that are integrated into Safari.
For a while, however, I started to have more and more problems with accessing some web pages that I had to access for professional purposes.
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Google Analytics Internal Error pe Safari
The first problem I noticed is the impossibility sometimes to access Google Analytics. “Internal error. Please try again later. ” and the lack given in reports.

Analytics has encountered an unexpected condition and cannot fulfill your request.
The same thing happens if I return to "Home" in Google Analytics and try to access the views of a property. Error in the waterfall, which opens Google Analytics in Frame superimposed, with the error message:
Internal error. Please try again later.
Analytics has encountered an unexpected condition and cannot fulfill your request.

Google Analytics: Missing Permissions
After a few more clicks in trying to access a report, it seems to me that Google Analytics wants to show all their error codes in Safari 15.5.
Missing permissions
You do not have access to the account, property, or view. Contact an Analytics administrator who has the Manage Users permission.

There was no question to have no permission or be authenticated with Google account.
How we solve Google Analytics Internal Error on Safari
When I was ready to take a possible migration to another Internet browser, most likely Google Chrome, I thought if I did something to cause this error. And yes, I had made a change, but the error should not have appeared anyway.
Some time ago I changed the language to display Google services. I passed it from US to EN, while I was doing some tests. It seems that this was the cause from which Google Analytics, Google Merchant and Google Ads started returning errors every time I try to access them.
So, if you encounter Google, Safari Safari, iPhone or iPad services, go to Google account At Personal Information and Schimate the language in place the language in which Google services are displayed.
If you necessarily keep up the current language in which Google Serivics are displayed but without appearing Google Analytics Internal Error, make a total cache and cookie wipe.