1Password share password vault between companies

Hello everyone,
I would like to share a password vault in the Password Manager 1Password between two user accounts that are in different company environments.
Sharing vaults with each other in the same company environment is possible, but I can't find an option to share them across companies.
Sharing a vault without an account is only possible for a maximum of 30 days - so that doesn't help me either.
Unfortunately, it is not possible to get support from 1Password.

Does anyone here already have a solution?

Thanks