What is the best way to professionally handle blame for an issue that was not handled by seniors?

Thanks 

Well, either you can say I am sorry " this is not from my duties! " , or you can get this chance to handle what seniors could not did and then you will be a super hero. 

Regards 

First of all the issue need to be listed carefully, it would be blame also. Please remember that blames are also one kind of grievance which might not have any actuality. Once a blame is raised and which is not being handled properly by senior, you need to give a proper hearing of the issue first. 

Second, you need to point down / segmentation of the issue.

Third, you need to give proper logical answers and bring the actuality with facts & figures. Please remember that you have to give enough time in this discussion. So that all sorts of questions can be addressed with care. 

Sometimes the delegation of duties from senior management silently includes the delegation of blame as well. In my opinion, the optimum way to handle such an issue is to not accept nor deny the blame, since you have to support and stand by the upper management. Some vague answers and leading the conversational point to secondary issues, while balancing between modesty and defensiveness is the way to go.

By employing diplomacy skills and operating as a wave crusher in such cases can gain you significant favour from upper management, while strengthening your current position at the same time. 

As my experiance, first thing I need to understand the issues and give my customer space to express his feeling and issue while show him that I am lestining to him carfully and I do understand his points. Then, Apologize to him and explain to him if there is any miss understanding. Beside, I will explain to him the stips that I will do to solve his issue.

Blame meaning - feel or declare that (someone or something) is responsible for a fault or wrong.

The best way to handle blame professionally is to hear out both sides;- accused and the accuser, afterwhich you get to weigh in on the problem that brought about the blame, then get the best solutions for both parties to resolve the issues.

In summary, get to the root of the problem, uproot it and dissolve blame professionally.

Stay in control. Learn from it, prevent same condition in the future, increase performance is the best way to answer blame. thanks for invitation.

To go in more detail & find the reason of blame. Once you know the actual reason you will have hundreds of ways to handle it.  

humbly listening. effective communication and responding instead of reacting. 

If the issue is still active ,say that you will work it out with your team,is its is in the past ,presenting the facts should be enough.

First, the case must be heard first.

Second, you need to examine the problem.

Third,  you should give sufficient time in this discussion. So that all kinds of questions can be handled carefully.

First of all, Analyse the issue. Take a QA session with the seniors about the issue and then put a solution for it.