My wifi shows a blue check mark but it isn't connecting to the internet

Wondering if Apple support's article (link below can help::

How to: Use 5G with your iPhone - Apple Support

Also:

The above article says:

If you turn on Low Power Mode, 5G is disabled except in some cases like video streaming and large downloads. With iPhone 12 models, Low Power Mode disables 5G Standalone (where available).

So you may need to check if Low Power mode is turned on.

More tips if needed:

How to: Connect iPhone to the internet – Apple Support

Jazz_95 Said:

"My wifi shows a blue check mark but it isn't connecting to the internet: How do I fix this issues, my phone when I go to settings shows a blue check mark but where it says 5g it isn't connected to WiFi"

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About "Not Connected to WiFi":

Just because you are connected to a network, does not mean you have an Internetconnection. You may be connected to an internal LAN, and not to the Internet.