HTML SIGNATURE IN OUTLOOK BROWSER

I am currently siting with a situation with one of my work colleagues emails.

She prefers to use outlook on her browser but I have created HTML signatures for the whole organization.

Her signature however will not display the images what so ever.

The preview when you add the signature in looks great but as soon as she tries to type a new mail all the imagery suddenly disappears.

How on earth can wed fix this issue?

I have tried on my browser both edge and chrome and my account works perfectly fine, it's her that is struggling with this issue.