Location Update rejections with cause “Unknown Subscribers in the HLR”

CORE
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Dear Experts.

The stats were thoroughly check and analyzed and it was found the most of the location update rejections were caused by “Unknown Subscribers in the HLR” in below top 10 LACs. (CS Core Huawei).

Any suggestion some proven methods parameter optimization, features, strategies to improve LUSR KPIs as the above the top failures caused?

Location Update rejections with cause “Unknown Subscribers in the HLR”

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Pls check these IMSIs allowed to latch in your network (PLMN)HLR VLR In roamer if not then bar these IMSIs

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Noted