Check that you're using a fresh DNS cache

Every DNS record lookup is cached by default up to the value specified in the time-to-live (TTL) setting of the record.

Whenever you change a record, the old record value may live in your cache until the expiration, giving you the impression the update wasn't performed.

Check the record propagation delay

If you recently changed a record, it may take a while for the change to propagate. This is especially true if the record has been cached by your local ISP.

Flush DNS

DNS cache can be cleared via command line or from browsers also. Steps to flush DNS Cache for major operating systems and browsers are as below.

https://dnschecker.org/flush-dns.php/

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