Clients are all members of the board

When the clients are signing as members of the board of an entity, this must be specified both in the signature line and in the notary certificate. The notary is not responsible to check the corporate documents to prove they are all members of the board. However, the notary must check the government photo id of member and have them sign your notary book. The notary could do a jurat and ask each member to affirm his/her membership on the board. The notary could also simply ask the individual to affirm that he/she is a member of the board.