UK ordered three months earlier, actually had similar issues.
Production setback as first mass vaccination campaign gets under way
www.ft.com
Pfizer the same. We took a 50%-60% hit on initial delivery supplies.
The sole difference is we weren't as impacted because they had more time to iron them out, because we ordered earlier. It really is as simple as that. 80% of the UK vaccines are made in the UK, the European facilities went online later due to it being a later order. Expecting them to mass produce a product which isn't proven to be commercially viable just to meet an advance order that would be null and void if it doesn't work is, obviously, unreasonable. And again:
This could very easily affect the UK in a few months. If those factories have a reduced yield in the UK, then we'll get less doses. The difference, of course, is that as time goes on more options become available and supply increases to reach demand, which hasn't happened yet. The EU were too slow due to bureaucracy and process, and - to be blunt - simply unlucky.
By your definition, if AZ failed in their "best efforts" by having only a limited number of facilities and having issues, then Pfizer haven't made best efforts either - nobody has. You conveniently skirt around that fact.
Your position is reactionary to failure, not one of logic. It's understandable, but while AZ have screwed up, it's an understandable screw up. In a 'normal' time, it'd be brushed over, nobody would care, there'd be an understanding of issues with live products and the order would be met eventually. We aren't living in a 'normal' time, so everything is magnified.