My last 2 companies, LinkedIn asked me to add an email address associated with the said company and actually confirm via said email in order to add them to my profile. So, if I worked for FooCompany, I had to have a @FooCompany.com email which is setup by someone at the company itself. Does this not cover what you're talking about?
According to my research, LinkedIn only does this for executive and now recruiter-like titles, but not broadly. You may be able to in order to get "verified on LinkedIn" but it's not a requirement for showing association with a company.
https://www.theverge.com/news/771210/linkedin-recruiter-exec...
I have the same. The difference is, if you do email verification, you will "verified" status. If not, you can still add the company to your linkedin, just unverified, which is not a label.
You mean @fooco.com? Or @foocousa.com? Or @fooco.xyz? @fooco.ai? @foocoltd.net? @foo.co.uk?
How would LinkedIn validate that your email domain belongs to the company you claim to work for?