Welcome to The Cove. In principle, virtual-only audits are not allowed. ISO 17021 requires the registrars to perform
on-site audits. The IAF mandatory Document #4 allows for (partial) virtual audits of virtual sites.
The above applies to properly accredited registrars, as they have to follow ISO 17021. The unaccredited and pseudo-accredited registrars will be happy to take your money, issue a certificate, while remotely auditing you, if you catch my drift...