Firstly, as has often been discussed here in the community (e.g. here or there), the Blue Pills have not been built with original STM32F103s for years, but with cheap counterfeits that are not (or cannot be) supported - which is what @Tesla DeLorean means with his last question.
Secondly, are you using an original ST-LINK from an authorised dealer (i.e. not from Ebay or other ‘trustworthy’ sources), or one in a tin can? With the latter, the connection may not work either, as these are also cheap counterfeits that are not (or cannot be) supported.
Regards
/Peter
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