Microsoft Edge IE compatibility mode is not supported.
It is also described in the note of the client requirements below.
https://document.intra-mart.jp/library/iap/public/iap_release_note/texts/support_environment/index.html#client-requirements
“Only standard mode is supported for the client browser.”
[When a problem occurs in a browser other than the standard mode]
Please break down the problem by checking if the same event occurs in a supported browser (standard mode).
If a similar event occurs, please contact support.
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iAP/Accel Platform/All Updates
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FAQID:1194