It appear the problems lies with Astra Zeneca vaccine:
‘…The AstraZeneca vaccine technically has two names – Vaxzevria which is produced in Europe and Covishield which is produced under licence by the Serum Institute in India.
It’s produced to the same specifications using the same ingredients, but Covishield doesn’t have a sales licence in the EU. The manufacturers presumably didn’t think this was important since their product is used mostly in India and Africa, but have now run into a problem – the EU’s vaccine passport rules specifically states that it will accept all vaccines licenced by the European Medicines Agency, which does not include Covishield.
This means that travellers from India and Africa vaccinated with it cannot use vaccine certificates for entry to the EU.
This is also a problem for some British travellers, since the UK’s vaccine programme has used large amounts of the Indian-produced AstraZeneca product.
Arrivals from the UK who are fully vaccinated with Pfizer, Moderna, Johnson & Johnson or AstraZeneca’s Vaxzevria product are not affected by this.
My vaccination record does not specify which variety of Atra Zeneca I received. So since I cant beat ‘the system’ I’m going to cut my losses, say nothing about my two previous jabs and just line up for a Pfizer or Johnson &Johnson jab and consider it the booster I was expecting to get eventually anyway