To update your last name to blank, you can use the relevant method in the API you are working with. For example, in the context of Azure SDKs, you typically have a method like withLastName(String lastName) where you can pass an empty string to set the last name to blank. Here's a general idea of how you might do it:
UpdateContactProfile profile = new UpdateContactProfile().withLastName("");
Make sure to check the specific API documentation for the exact implementation details, as it may vary depending on the SDK or service you are using.
References: