Issue in setting up learning recurrence in 26A or in 26B

Summary:

Facing issues in setting up learning recurrence in 26A or in 26B. The number field always gives me an error. Here are the details.

I get the same error and behavior in test 26B and prod 26A.

Content (please ensure you mask any confidential information):

Here are the step-by-step data entry.

Here is the error situation. Whatever value I enter the number errors.

Any help is much appreciated. thank you.

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Code Snippet (add any code snippets that support your topic, if applicable):