I have experienced a big bug in all my social media’s and WhatsApp just after installing the iOS 26 on the phone all my social media account I know blocked by meta and suffering
Installing iOS 26 would be completely unrelated to this.
Also, why would you think it's iOS that caused it? Meta are the ones sending you the notifications, so you should raise any issues with them, not Apple, and not us random Developers on these forums.
Meta restricted your accounts for a reason - ad that reason is shown in that first screenshot. It is totally inappropriate for these forums.