
I can reproduce the issue on the same version of Edge on Android. I can see that it navigates to url microsoft-edge:https://rest-url
after opening Edge. I think that's why it shows blank in Edge.
I suggest that you can provide feedback about this issue by clicking three-dot icon on the bottom-> Send feedback in Edge mobile. Edge team will check the feedbacks and improve the product continuously.
Thanks for pointing out the issue. I'll also send feedback about the issue and hope it can be fixed soon. Thanks for your understanding.
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Regards,
Yu Zhou