I wanted to sell some shares for the loss on Vanguard and was "allowed". I then tried buying more shares in another account at Vanguard and got this:

"Buy orders are not permitted for securities in the following OTC Markets Group (otcmarkets.com) tiers including Pink Limited Information®, Pink No Information®, Expert Market, Grey Market or classified as Caveat Emptor (buyer beware) by OTC Markets Group (otcmarkets.com)."

So, can sell but not buy?