Was power provided to the receiver? The audio input channel on the stereo will not provide power to run the receiver.
Or your PC is already paired with another device.
Just asking.
I'd say this one.🤔 https://www.lazada.co.th/products/bt-50-audio-receiver-bluetooth-receiver-35mm-rca-35mm-aux-i4711698829-s19430184447.html?c=&channelLpJumpArgs=&clickTrackInfo=query%3ABluetooth%2Breceiver%3Bnid%3A4711698829%3Bsrc%3ALazadaMainSrp%3Brn%3A998f3b03cdbf343fa2a5947eb0bff32b%3Bregion%3Ath%3Bsku%3A4711698829_TH%3Bprice%3A129.7%3Bclient%3Adesktop%3Bsupplier_id%3A100262013019%3Bbiz_source%3Ah5_internal%3Bslot%3A8%3Butlog_bucket_id%3A463818%3Basc_category_id%3A5522%3Bitem_id%3A4711698829%3Bsku_id%3A19430184447%3Bshop_id%3A3994973&fastshipping=0&freeshipping=0&fs_ab=2&fuse_fs=&lang=th&location=สมุทรปราการ&price=129.7&priceCompare=skuId%3A19430184447%3Bsource%3Alazada-search-voucher%3Bsn%3A998f3b03cdbf343fa2a5947eb0bff32b%3BoriginPrice%3A12970%3BdisplayPrice%3A12970%3BsinglePromotionId%3A900000019700212%3BsingleToolCode%3ApromPrice%3BvoucherPricePlugin%3A0%3Btimestamp%3A1698478943406&ratingscore=4.909090909090909&request_id=998f3b03cdbf343fa2a5947eb0bff32b&review=55&sale=200&search=1&source=search&spm=a2o4m.searchlist.list.i80.1900765e4TtfkF&stock=1
The RCA version.