Hello,
Go to Settings > Accounts > Access Work or School, click on Connect.
If you already have a work email listed there, select and disconnect first, then restart. Come back to this page.
Don't sign into your work email yet. Instead, click on "Join this device to Microsoft Entra ID" (it has been renamed to Entra ID from Azure ID, is that why you cannot find it?) On the next step, you will be prompted to sign in, then you can sign in.
Once done, restart the computer and you can use "switch user" to sign in using the company email.
If you still canno find that option, hold down Windows + R keys, type in winver and press enter, can you verify that it is really Pro that you have?