Hi @theadaloguy,
Interesting question 
The problem lies within %2F in between the times
20210513T050213Z
20210514T050213Z
Short solution: to make it work, replace %2F with / (forward slash) in your External Link. Worked for me in the preview.
Longer explanation: seems that Adalo does URL encoding when working with external links. So, in browser link %2F transforms to “/”. But Adalo transforms it to %252F: it thinks that % should be encoded, encodes it to %25, and leaves 2F as it is.
You can copy and compare 2 addresses from address string in the browser and you’ll immediately notice the difference.
An interesting question is why Adalo doesn’t do the same with %20, and how this encoding of % could be avoided…
Best regards, Victor.