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Dear Kaspars Pudans,
Greetings! Thank you for posting in Microsoft Community. We are happy to help you.
Per your description, it seems that this issue only occurs on Apple devices and only while using Safari to open a file or document library from a specific SharePoint site.
To narrow down the situation and check whether it's specific SharePoint site issue or your account issue, may I know if other users (your colleagues) in your organization meet the same problem when they open files from that SharePoint site by using Apple device?
Look forward to your reply. Thanks for your time and cooperation!
Have a nice day!
Sincerely,
Tina | Microsoft Community Moderator