working with multiple S/MIME certs. - invalid certificate

Hi everyone,

Following situation:

• Outlook Profile: Outlook
• Accounts: 1 Personal Account (Hotmail), 1 Work Account and 4 mapped shared mailboxes
• All Exchange Online!
• One Security Setting with a DigiCert Cert. for my work mailbox and the shared
• S/MIME works perfectly with all work-related accounts

Then I decided to add a second security settings with a WiseID Cert. for my hotmail, cause I have one and I want to use it. As soon as I try to send an email from this account, this error message pops up...

Okay, so I've made a second profile with just the hotmail Account set up and the security setting with the cert. for this email. Works perfectly...

My question:

Why does it work in a separate profile and not in my main profile with the other accounts?

Thanks for every reply ❤️