These are real failures against AA, not edge cases we are relaxed about. Both have a fix date and a workaround.
The 90-day bars are decorative reinforcement of a value that is also written as a percentage, but the colour pairing still fails. Workaround: the percentage and the incident list carry the same information in text.
Screen readers read the chain as a flat list, losing the parent relationship between certificate and root. Workaround: the JSON response from the API carries the structure explicitly.
A verification verdict is the most consequential thing this product says, so colour never carries it alone. Every verdict shows an icon, a machine code such as SIGNED_QUALIFIED, and the state of both trust anchors as filled or outlined badges. A screenshot in greyscale remains readable, and so does an API response.
Write to [email protected] with the page, what you were trying to do and the assistive technology you use. We reply within five working days. If our answer does not satisfy you, you may contact the national accessibility enforcement body in your member state; in the Netherlands that is the Rijksinspectie Digitale Infrastructuur.