You should be able to. However you should also follow-up with Atlassian Support team with a support request to ensure if there are other things that you need to perform in addition to just applying the new license key.
Best, Joseph Chung Yin
On October 20, 2021, Atlassian published a security advisory for Jira Service Management. The full advisory is available at this link. We've seen a number of questions already asking for...
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