  Tidal disruption events (TDEs) can potentially probe low-mass black holes in
host galaxies that might not adhere to bulge or stellar-dispersion
relationships. At least initially, TDEs can also reveal super-Eddington
accretion. X-ray spectroscopy can potentially constrain black hole masses, and
reveal ionized outflows associated with super-Eddington accretion. Our analysis
of XMM-Newton X-ray observations of the TDE AT2021ehb, around 300 days
post-disruption, reveals a soft spectrum and can be fit with a combination of
multi-color disk blackbody and power-law components. Using two independent disk
models with properties suited to TDEs, we estimate a black hole mass at $M
\simeq 10^{5.5}~M_{\odot}$, indicating AT2021ehb may expose the elusive
low-mass end of the nuclear black hole population. These models offer simple
yet robust characterization; more complicated models are not required, but
provide important context and caveats in the limit of moderately sensitive
data. If disk reflection is included, the disk flux is lower and inferred black
hole masses are $\sim$ 0.35 dex higher. Simple wind formulations imply an
extremely fast $v_{\mathrm{out}} = -0.2~c$ outflow and obviate a disk continuum
component. Assuming a unity filling factor, such a wind implies an
instantaneous mass outflow rate of $\dot{M} \simeq 5~M_{\odot}~{\rm yr}^{-1}$.
Such a high rate suggests that the filling factor for the Ultra Fast Outflow
(UFO) must be extremely low, and/or the UFO phase is ephemeral. We discuss the
strengths and limitations of our analysis and avenues for future observations
of TDEs.
