That's the expected behavior, you cannot change the From address when sending an invite. It's always tied to the account you're currently using. The only way you can change it is to have the shared mailbox added as additional account (https://www.michev.info/Blog/Post/3567/how-to-add-a-shared-mailbox-as-additional-account-in-outlook-2022-version). Or use third-party tools/add-ins.
Send invite from shared mailbox
From option is missing while trying to send an invite. How to enable 'From'
While sending a normal email, 'From' option is visible. its not appearing only while sending a invite
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