Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Hello Alexa Miao,
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I can see that you have sign up for the Microsoft M365 LinkedIn Premium 12-month offer on Feb-19, but you haven't received your LinkedIn premium subscription yet.
LinkedIn activation email can take up to 7 days for the email to get to you. In some cases, it may take 10-14 days for the email to arrive. After that amount of time, make sure you look for the activation mail in the spam section too.
So right now, the best course of action to take is to please be patience and wait.
If you need further assistance, feel free reply back to this post. I'll be happy to help.