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Hi there, @val2256. Before performing a Factory reset on your S21 (as this might not be necessary at this stage), I recommend consulting and following all the suggestions provided in the guide below:
The page below should prove useful as well:
https://insights.samsung.com/2021/04/20/how-do-i-know-if-my-smartphone-is-infected-with-malware-2/
It is entirely possible that the message you have seen is a "false positive", indicating that you have a virus on your phone so that you click on a third-party link. Nevertheless, going through the steps in the first guide would definitely be beneficial in this instance.
Please let us know how you get on.