Delivery Hero Engineering Manager interview questions

The interview process was pretty straightforward and standard. System Design, Leadership, Management, Stakeholder management, Delivery management related. I got a quick response from the recruiter after the rounds that they would roll out an offer. A few days later, I got an email saying that the offer cannot be rolled out without any details provided. I followed up a couple of times but still no response. If a candidate has spent so much time on the interviews and when you gave a soft signal that an offer would be rolled out, I believe it's the bare minimum courtesy to circle back and provide an explanation on what went wrong.

tech intro - 30 min ML questions related to the team domain + 30 min system design hiring manager - behavioral 60 min with product managers / stakeholders - behavioral, more about processes - 60 min bar raiser interview 90 min - more behavioral but with few technical questions