@Adrian Lane Thank you for contacting Azure Support. With Standard V2 the limit is 100 active. With WAF V2 it is 40 active. Active listeners are ones with a backend pool and not just plain redirects. therefore, HTTPS redirect listeners do not count and the limit remains 40 with those redirects. Hope this helps!
Please let us know if you have any further questions and we will be glad to assist you further. Thank you!
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