Bing Recommends Against Batch Mode For IndexNow URL Submission
Briefly

"Do not batch URL groups for IndexNow. Bing creates a Moderate error because it can overwhelm the servers. Batch mode is not recommended because it can cause server overload and delays in indexing."
"Batch Processing: URLs are submitted in groups or batches. This method can overwhelm servers and cause delays. Streaming allows for more immediate updates to search engines."
"Immediate Updates: Ensures that changes are reflected in search results as quickly as possible. Reducing server overload is key to improving indexing efficiency."
"The IndexNow documentation shows the urlList attribute as an array, suggesting batching is possible, but it’s likely for short pulses rather than longer intervals."
Read at Search Engine Roundtable
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