Issue with certification task disappearing

Not able to take Certification .
I was trying to give ACAD Level 1 certification and Certification was assigned in my task list. Once I tried to open the task and start the certification by clicking Begin now but task suddenly disappeared and was not able to see the task again. Even I tried from different system.So I was not able to take Certification. Need help .Following are screen shots of what I did PFA.

This is Important....

Not Able To Take Certification.docx

OriginalPostID-129567

OriginalPostID-129567

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