  The project MOMO (Multiwavelength Observations and Modelling of OJ 287) was
set up to test predictions of binary supermassive black hole (SMBH) scenarios
and to understand disk-jet physics of the blazar OJ 287. After a correction,
the precessing binary (PB) SMBH model predicted the next main outburst of OJ
287 in 2022 October, no longer in July, making the outburst well observable and
the model testable. We have densely covered this period in our ongoing
multi-frequency radio, optical, UV, and X-ray monitoring. The predicted
outburst was not detected. Instead, OJ 287 was at low optical-UV emission
levels, declining further into November. The predicted thermal bremsstrahlung
spectrum was not observed either, at any epoch. Further, applying scaling
relations, we estimate a SMBH mass of OJ 287 of 10^8 M_sun. The latest in a
sequence of deep low-states that recur every 1-2 yrs is used to determine an
upper limit on the Eddington ratio and on the accretion-disk luminosity. This
limit is at least a factor of 10 lower than required by the PB model with its
massive primary SMBH of >10^{10} M_sun. All these results favor alternative
binary SMBH models of OJ 287 that neither require strong orbital precession nor
a very large mass of the primary SMBH.
