Your certifications are linked to your Oracle Testing ID, which is part of your Pearson Vue account. My own recommendation is that you always use a personal email address rather than a work email address for that account. In Pearson Vue, there is an account settings option that allows you to indicate what OPN company you work for. This should be changed when you move from company A to company B. Certifications always stay with you.
You then have your Oracle SSO account (i.e. 'J.A.' for you). This serves are your Certview login. It gets linked to your Pearson Vue account through your Oracle Testing ID. It doesn't have to use the same email address as your Pearson Vue account. However, again, I'd recommend that it use a personal email account rather than a work email account.
From your post, I think that you have two Oracle Single-Sign-On accounts, one for a personal email and one for your work email that has been badged to OPN. Creating the OPN account with your work email was not necessary. My own account (personal email) is badged to my current company. You could do the same. In any event, it is the OPN setting in your Pearson Vue account that 'points' your OPN certifications at one company or another.