Telegram IV engine supports that kind of things, but your template somehow changed the link and the map isn't displayed. Anyway, some investigation is needed.
Type of issue
IV not generated for target page
Reported
Feb 22, 2019
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<iframe src="https://www.google.com/maps/d/embed?mid=1_E_sGbTLyhobPAWuG8DbKhqKqz_b0hHt" width="640" height="480"></iframe>
Telegram IV engine supports that kind of things, but your template somehow changed the link and the map isn't displayed. Anyway, some investigation is needed.