Unavailable stocks - reason?

DHC Diversified healthcare trust
CPLP Capital product
OPI Office Properties Income Trust
FSP Franklin Street Properties Corp.
DLNG Dynagas LNG Partners LP
EARN Ellington Residential Mortgage REIT
KNOP KNOT Offshore Partners LP
CHMI Cherry Hill Mortgage Investment Corporation

Is there any special reason, why these stocks are not listed with T212? Or can be added to be tradeable? Thanks

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