To be able to share a dashboard you need to als have the "Share dashboards and filters" Global Permission. Check and make sure that you are a member of a group set to this permission set in the global permissions.
Additional details can be seen here:
Alternatively I have seen browser extension cause similar behavior to this before so try running an incognito/private browser session with all extensions disabled to see if its possibly an interrupt to the page scripting because of a browser extension
Let me know if either of these were the cause.
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