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I believe you are in direct contact with the product team for a follow up discussion. I am posting Amit's answer here in case other companies run into this issue.
Answer
Would it be possible for you to define a filter condition so that the cardinality (i.e. unique values) of the attribute is at 150 values or less. For example, we recently conducted an ONA analysis at Microsoft where we specified a filter condition to analyze a specific Division at Microsoft rather than looking at the whole of Microsoft. By specifying the filter, the cardinality of the attribute(s) was within the cardinality thresholds.
Also please note, trying to examine an attribute with a very high cardinality will result in a "hairball" which will be difficult to draw insights from. Therefore, the recommendation is to specify a filter condition to bring the cardinality which the 150 limit.
Microsoft
I believe you are in direct contact with the product team for a follow up discussion. I am posting Amit's answer here in case other companies run into this issue.
Answer
Would it be possible for you to define a filter condition so that the cardinality (i.e. unique values) of the attribute is at 150 values or less. For example, we recently conducted an ONA analysis at Microsoft where we specified a filter condition to analyze a specific Division at Microsoft rather than looking at the whole of Microsoft. By specifying the filter, the cardinality of the attribute(s) was within the cardinality thresholds.
Also please note, trying to examine an attribute with a very high cardinality will result in a "hairball" which will be difficult to draw insights from. Therefore, the recommendation is to specify a filter condition to bring the cardinality which the 150 limit.