Hi Vin,
Thanks for reaching out with your BoldGrid Post and Page Builder questions! I tried setting this up for you and ran into your same problem. The tabs do have CSS IDs but I noticed that if you link to the tab id it will jump you to the part of the page where the tabs are but it won’t actually activate the tab.
I’ve created a feature request on your behalf because I feel this functionality should be an organic part of the tab block component as well. Our developers will review the feature request and hopefully we’re able to have this integrated into Post and Page Builder in an future update.
Thanks Vin, you can check back here at anytime for an update!