we can dial using openURL and using tel://number. the moment we have something like "tel://number;conference%23" it fails, but only on iOS 15.4 beta, this same conference number dialing works without issue on iOS 15.3.1 and previous versions. There must be tickets with their engineers about this issue and out ticket has yet to be replied so likely they will be addressing in the actual release version of 15.4.
parapakura
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