I would like to draw all meteor scatter operators' attention to the MS Procedure section 7.4.9 VALID CONTACTS
"... However no recourse should be made during the contact to obtain the required information, change of frequency, antenna direction, etc. via other methods such as the DX Cluster, talk-back on another band, etc. Such secondary methods invalidate the meteor scatter contact. In essence: if anything concerning the ongoing QSO attempt is agreed through other means than the QSO attempt frequency a new start is required."
At the beginning of the year I asked in the forum how stringent this should be interpreted especially for firsts QSOs. The broad consensus was that a very harsh interpretation should be used.
Actually this does not apply to MS QSOs only but to any type of QSO.