Open the Settings app
Tap Safari
Turn off Block Pop-ups
If needed, turn off Fraudulent Website Warning only if you understand the risk
Close and reopen Safari
Reload the website
If pop-ups still do not appear, check Screen Time restrictions
Go to Settings
Tap Screen Time
Tap Content & Privacy Restrictions
Tap Content Restrictions
Tap Web Content
Select Unrestricted Access
If using Chrome or another browser, check that browser’s pop-up settings too