@Pallavi Mali -
Welcome to the community. The best way to obtain further assistance on your account, it is recommended to contact Atlassian Support (https://support.atlassian.com) for further assistance. Lastly, your question doesn't have enough details for the community members to determine the possible causes.
Hope this helps.
Best, Joseph Chung Yin
Jira/JSM Functional Lead, Global Technology Applications Team
Viasat Inc.
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