Use custom hosted domain for Pass-generated random email address prefill
ProtonMail already hosts custom domains with the option of a catch-all address.
Add feature to configure a hosted domain to auto-fill the email field with a ProtonPass generated random email address - while confirming the domain has catch-all turned on at configuration time.

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Fabio MOREIRA commented
Using a custom domain for hide-my-email aliases would help address this request, I think.
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J-A.G commented
This feature is available with Fastmail and I just transferred from Fastmail to Proton and I am very surprised that I cannot use my custom domain for the Pass-generated random email address prefill. For example, If I used a Fastmail email address with Epic Games account, they would deny it and they would not let me change my email address. I then used a masked generated random email address for my custom domain, and it was accepted by Epic instantly. Time will tell in 3 weeks if I have issues changing my Epic Games email address with the passmail.net domain. I would love an update on this issue as I feel it's incredibly important. What would organisations do in this instance? If they wanted to use their own domain? I am already paying a premium price for Proton and feel this should be already included.