Subscriptions (Ibots) are either not being delivered or taking very long to deliver.

Hi, rkumar 

According to your description,I think you can check the considerations and troubleshooting in PBI subscriptions.

• To avoid subscription emails going to your spam folder, add the Power BI email alias ([email protected]) to your contacts. If you're using Microsoft Outlook, right-click the alias and select Add to Outlook contacts.
• Dashboards with over 25 pinned tiles, or four pinned live report pages, may not render fully in subscription e-mails sent to users. We suggest that you contact the dashboard designer and ask them to reduce pinned tiles to less than 25 and pinned live reports to less than four to ensure that the email renders correctly.
• For dashboard email subscriptions, if any tiles have row level security (RLS) applied, those tiles will not display.
• If the links in your email (to the content) stop working, it may be that the content was deleted. In the email, beneath the screenshot, you can look to see if you subscribed yourself or if someone else subscribed you. If someone else, ask that co-worker to either cancel the emails or re-subscribe you.
• For dashboard subscriptions, certain types of tiles aren't yet supported. These include: streaming tiles, video tiles, custom web content tiles.
• Report page subscriptions are tied to the name of the report page. If you subscribe to a report page, and it gets renamed, you will have to re-create your subscription.
• If you aren't able to use the subscription feature, contact your system administrator or IT help desk. Your organization may have disabled this feature or a maximum subscriber limit may have been reached.
• Email subscriptions do not support most custom visuals. The exception is those Power BI custom visuals that have been certified.
• Email subscriptions are sent with the report's default filter and slicer states. Any changes to the defaults that you make after subscribing don't show up in the email. Paginated Reports do support this capability and allow you to set the specific parameter values per subscription.
• Email subscriptions do not support R-powered Power BI visuals at this time.
• Subscriptions may fail on dashboards or reports with extremely large images due to email size limits.
• Power BI automatically pauses refresh on datasets associated with dashboards and reports that haven't been visited in more than two months. However, if you add a subscription to a dashboard or report, it won't pause even if it goes unvisited.
• Keep in mind that like other BI products, the time you set your subscription for is when the subscription begins processing. Once the report processing is complete, then the subscription is queued and sent to the e-mail recipients. While we strive to process and deliver all subscriptions as quickly as possible, there are times at peak demand when you may see a longer delay due to the number of subscriptions that can be sent at once. For the majority of customers, they shouldn’t see a delay of more than 15 minutes to process and send their reports, though it may take up to 30 minutes for certain times and tenants that have significant usage. We never expect any delay in delivery to be more than 60 minutes from the time the subscription is scheduled. If any customer experiences a delay of that length, they should first ensure that the address [email protected] is on your safe sender list and isn't blocked by your e-mail provider. If the email isn't being blocked, they should contact their Power BI administrator or IT help desk for assistance.

Reference:Subscribe yourself to reports and dashboards - Power BI | Microsoft Docs

Best Regards

Janey Guo

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