Embedding a form onto my website, redirect isn't working

I see a few people have asked this question already, but I don’t see a clear solution in those other threads.

I’ve embedded a form on our WordPress site, and added a redirect for when someone completes the form. However, it doesn’t work. It looks like it activates the pop-up blocker on my laptop (which is a default setting on a MacBook Pro I just purchased, so I’m assuming others will have that, too). It reverts back to the form instead of sending people who completed it to my thank-you page.

Is there anything else I should try? Thanks!

Another thread where this is asked:

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