did you ask this question to the people that made the cms widget?
as their help page says 2017 is needed I would assume you upgraded Muse to 2018 and that busted the site but perhaps they have a patch... in any event they are the people you need to talk to
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I have the same problem as you with all my websites where I have worked with the Mumblr widget from Muse Themes.
I don't have a solution for the problem yet, but I have found out why this is so and can explain the interrelations to you.
I hope you understand the context. It's a little complicated to explain ;-) But in the end still logical and comprehensible, I hope!
Theoretically, every visitor to a website where Tumlr content is embedded to, should first see the Tumblr privacy page and click on "accept" to be able to see Tumblr content on the particular website.
How should this ever be done???
I hope I could help you with my considerations and would be very happy if you share every new conclusion in this matter here in the forum!