The recognition of academic degrees is not affected by the UK leaving the EU.
If you didn’t apply before the end of 2020 for recognition of any professional qualifications in regulated professions (such as teaching, law, nursing, etc), it is probably too late.
- Austrian Government Brexit Website: https://www.bundeskanzleramt.gv.at/en/topics/brexit/education-studying-youth-mobility-and-research.html
- UK Government Guidelines on Recognition of Professional Qualifications
- Working in Austria Competency Assessment