For what it’s worth, proton has 4 domains you can create aliases under, even if you can’t get firstlast@protonmail dot com, you may be able to get @pm.me or @proton.me.
You can also use custom domains in protonmail, you’d just need a domain registrar and the ability to point your MX records to them. Don’t skip the SPF, DKIM, and DMARC steps.
For what it’s worth, proton has 4 domains you can create aliases under, even if you can’t get firstlast@protonmail dot com, you may be able to get @pm.me or @proton.me.
You can also use custom domains in protonmail, you’d just need a domain registrar and the ability to point your MX records to them. Don’t skip the SPF, DKIM, and DMARC steps.