Error message: "Oops, GigRadar couldn’t send this proposal because it looks like you are using links in your cover letter that are not accepted by Upwork. ..." What to do?

You encounter an error when including links in a Cover Letter that does not meet Upwork's acceptance criteria.
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The error is not related to GigRadar's link usage restrictions but rather stems from limitations within the Upwork platform. ❗️
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An 'unsafe link' refers to a link leading to another platform through which the freelancer and client can communicate outside of Upwork, violating the Terms of Service (TOS). More details can be found here:
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https://community.upwork.com/t5/Freelancers/Is-communicating-outside-of-Upwork-a-TOS-violation/m-p/1242149/highlight/true#M738470
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https://www.upwork.com/legal#COMMUNICATINGTHROUGH