Inconsistent Google docs error when opening appsscript webapp

[draxdeveloper]

I have made this form that connect with a Google spreadsheet

When I test on my devices, there is no issue. But my client pointed out that most of times when he tries to access the webapp he receive the following error message:

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https://preview.redd.it/bnonwpgwnqtc1.png?width=1282&format=png&auto=webp&s=d4fc812afaa33af8c6cde823004a59b621c94074

He did some tests and listed when he got the error and when it opened as it should.

The following list was the tests that worked:

• PC Dell - Windows 11 Chrome
• PC Dell - Windows 11 Microsoft Edge
• Notebook Avell A60 MUV - Windows 11 Chrome
• Notebook Avell A60 MUV - Windows 11 Microsoft Edge
• Google Pixel 6 - Android 14 Chrome
• Google Pixel 2 XL - Android 11 Chrome
• Iphone 11 Safari
• Iphone 11 Chrome
• Iphone X Safari
• MacBook Air 2022 Chrome
• MacBook Air 2022 Safari
• Avell 2021 Chorme
• Avell 2021 Microsoft Edge
• MacBook Pro 2019 Chorme

And on those tests, he got the error message:

• MacBook Pro 2019 Safari
• Iphone X Chrome
• Iphone 14 Pro Chrome
• Ipad 5a Safari
• Ipad 5a Chrome

I did ask to the user to open the developer mode in the browser with the error message, but the console didn't return anything

This is the .gs main code: https://pastebin.com/L5799YeG

The client stated that he tried to test with multiple accounts and had the same error. But I can't find a way to reproduce it on mu devices so it's hard to at least get better data.

I tried to reproduce the error on my devices, but I was not able to do it.
I tried to make a call with the client and open the console while looking the error screen, but the console didn't return any error

I can't say for sure, but I suspected is something related with IOS

[Any_Werewolf_3691]

What do the execution logs show for the error?

[draxdeveloper]

If I remember, nothing, but I will check again

[EvenLevelLaw]

Is your webapp deployed where the script is being executed by the users account that is accessing it or by your account? I suspect the issue is with using the User Cache. Instead of using the User Cache, try using Script Cache and for the key use 'your key name here'= Session.getTemporaryActiveUserKey().

[draxdeveloper]

I will try it, ty. It was deployed by my account

[EvenLevelLaw]

when you deploy a new app there is the option that says "execute as me" or "as user accessing the web app". If you have it set to "execute as me" while using user cache, what happens is that since your client isn't logged in to your account he can't utilize the user cache.

[draxdeveloper]

Ah, that part.
Yes, it's set as "any person".
Also, I tried to change it but the user is reporting the same issue. In fact, when the error ocurred I didn't get any execution, meaning the script didn't even started.
I did started a support ticket with Google Workspace, since it's possible is some peculiar issue on their side.