Changing method to code below and setting FDPhysFBDriverLink1.Embedded to True will make it working. Without that the only workaround is to renamed fbclient.dll into fbembed.dll.
procedure TIBLib.LoadFB(const AVendorHome, AVendorLib: String;
AEmbedded, AThreadSafe: Boolean);
{$IFNDEF FireDAC_IB_STATIC}
const
C_FBClient: String = {$IFDEF MSWINDOWS} 'fbclient' {$ENDIF}
{$IFDEF POSIX} 'libfbclient' {$ENDIF} + C_FD_DLLExt;
C_FBEmbed: String = {$IFDEF MSWINDOWS} 'fbembed' {$ENDIF}
{$IFDEF POSIX} 'libfbembed' {$ENDIF} + C_FD_DLLExt;
{$ENDIF}
begin
if AEmbedded then
LoadBase(AVendorHome, AVendorLib, AThreadSafe {$IFNDEF FireDAC_IB_STATIC}, [C_FBEmbed, C_FBClient] {$ENDIF})
else
LoadBase(AVendorHome, AVendorLib, AThreadSafe {$IFNDEF FireDAC_IB_STATIC}, [C_FBClient, C_FBEmbed] {$ENDIF});
if AEmbedded and (Version >= ivFB030000) then
FEmbedded := True;
end;