Have you click "Cancel" when the dialog (Open in apps) shows ? (maybe accidentally or intentionally) If so , fenix cache the `cancel` operation and the dialog will not show for clicking any "tel:" link in the following 1 hour . You could "Force stop" fenix to reset the cache (Note: remove it from recent screen not work).
Bug 1852142 Comment 1 Edit History
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Have you clicked "Cancel" when the dialog (Open in apps) shows ? (maybe accidentally or intentionally) If so , fenix caches the `cancel` operation and the dialog will not show for clicking any "tel:" link in the following 1 hour . You could "Force stop" fenix (in "App Info") to reset the cache (Note: remove it from recent screen not work).