Super Priority visa query

Hello guys,
I have applied for entry clearance visa under the Super Priority Service (which gives a decision on the application within 24hours) offered in India. It’s been 4 days but have not received a decision on my application but have got an email from the UK Decision Making Centre stating “Unfortunately the processing of your application has not been straightforward and will be unable to decide your application under our customer service targets”. Should I be worried about the outcome? Has anyone else received this? Also how soon can I expect a decision on my application?
Any help would be appreciated.

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