Hello @Ambica Agarwal,
welcome to this moderated Azure community forum.
Unfortunately, the AZ-220 is discontinued.
Renewal is only valid until January 2024 and only you are currently certified.
This could be the reason why it cannot be connected anymore.
Please share the message you get while trying to connect it.
If the response helped, do "Accept Answer". If it doesn't work, please let us know the progress. All community members with similar issues will benefit by doing so. Your contribution is highly appreciated.